Absorption refrigerating apparatus



Filed Oct. 2, 1945 PE 'M'R'glE F Ill IIIHIIIII ll IHHII IN VEN TOR.

BY/WW Patented Nov. 7, 1950 UNITED STATES PATENT OFFICE Application October 2, 1945, Serial No. 619,821

- In Switzerland September 9, 1944 Section 1, Public Law 690, August 8, 1946 Patent expires September 9, 1964 2 Claims. 1

The present invention relates to a simple and inexpensive absorption refrigerating apparatus which, takes up small space, produces a relatively great refrigerating effect, and may be installed in a small part of the cupboard space.

In the types of absorption refrigerating appa ratus hitherto known, condenser and absorber differ from each other in structural form, the construction of which requires different devices and operations an makes a compact design of the aggregate impossible or at least very difficult.

These drawbacks are eliminated by this invention, in that condenser and absorber are each formed at least partly by a U-shaped bent tube, whereby all legs of the tubes are connected together with cast-on fins or lamellae intended not only for facilitating air-cooling, but also for effecting thermal contact between the condenser and absorber and also for stabilizing this apparatus.

The drawing shows diagrammatically one form of execution.

Fig. 1 represents the absorption refrigerating apparatus in sectional elevation and Fig. 2 the same in plan.

The condenser is denoted by K and the absorber by A. These parts of the aggregate are constructed essentially of a similar steel tube of. U- shape. Each of the two straight legs or arms a and a of these two tubes form with respect to each other an angle of the same size. On these arms of the tubes cooling fins b, consisting preferably of aluminium, are cast-on in such a. way that each fin connects all the arms of the tube of the condenser and of the absorber. Since the arms of the tube of the condenser and of the absorber are of the same shape and have the same dimensions, the fins b, which are also all of the same shape, can be cast by means of the same mould. These symmetrically shaped fins b are cast in such a way that the parts adjacent to the tubes are thickest, whereby good transmission of heat is possibl from the tubes 0. and a to the common fins b which have large contact surfaces while at the same time requiring relatively little material.

Due to this construction of condenser and absorber according to the invention, a great simplification in the mode of manufacture is obtained, since the tube arms of the absorber A and those of the condenser K can be provided with common fins in the same casting operation. As a result of this, in addition to the provision of large contact surfaces on the tube arms, technical advantages are attained with respect to the erection, the correct position of the component parts of the aggregate with respect to each other and with re- 2 spect to the other members of this refrigerating apparatus which work in connection with them, and also rendering the whole aggregate more rigid so that it is less liable to damage during transport.

Preferably the tube arms of the condenser and absorber are arranged in a vertical plane, and the fins are made narrow but long, so that these parts of the apparatus preferably can cover each other in plan, thus giving in addition to the abovementioned advantages in spite of a great saving in space and simplifying the casting-on of the common fins a great thermic capacity and contact between the absorber and the condenser,

which is of great importance for the function of such apparatus controlled by a thermostat.

The absorption refrigerating apparatus described above, can be manufactured comparatively cheaply in a simple operation, because of thesuitable form of the absorber and condenser, which saves space and avoids numerous welding operations hitherto required, for instance only for fixing the cooling fins, since the twoparts of the aggregate can be constructed essentially with the same rational method of working.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

-1. An absorption refrigerating apparatus comprising two aggregates, a condenser and an absorber, respectively, each of said aggregates including a U-shaped bent tube having diverging legs, the bend of the tube of the condenser and the bend of the tube of the absorber being arranged in opposed relation to each other, said legs of said absorber and said legs of said condenser being connected with each other by common cast-on cooling fins, whereby a thermal contact between condenser and absorber takes place and a rigid unitary structure is effected.

2. An apparatus according to claim 1, wherein the legs of the tubes of said condenser and of said absorber are substantially of the same shape and dimensions with respect to each other.

HANS STIERLllN'.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATEZNTS Number Name Date 1,818,727 Ludwig Aug. 11, 1931 2,072,652 Shafner Mar. 2, 1937 2,249,737 Backstrom July 22, 1941 2,290,532 Bufiington July 21, 1942 

